I have a mainform which I want to set up as a user interface. There are no options on this form other than buttons created to open other forms. I've created the forms and they all work if I simply want to open them over the top of the main form, but what I would like to be able to click on the 'menu' item buttons to change the central subform in the body of the screen.

Any body any ideas how this can be done? I tried several codes:...